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A far sighted person cannot see objects that are less than 100cm away. If this person ...

A far sighted person cannot see objects that are less than 100cm away. If this person wants to read a book at 25cm, what type and focal length of lens does he need?

A. convex, 20cm
B. concave, 20cm
C. convex, 33cm
D. concave, 33cm




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